Abstract

A compact tunable ultraviolet coherent light source based on diode lasers would have wide application. However, there are only a few reports on that at wavelength below 250 nm. We have generated continuous-wave coherent light at 214.5 nm by frequency-quadrupling an output of a high-power diode laser system through two frequency doubling stages [1]. Our motivation to this subject is a development of an all-solid-state light source for laser cooling of Cd⁺ ions, which we propose as a candidate for a future frequency standard [2].

© 1998 IEEE